土壤电化学性质的研究——Ⅹ.红壤胶体的表面性状和离子专性吸附对表面电荷性质的影响
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STUDIES ON ELECTROCHEMICAL PROPERTIES OF SOILS Ⅹ. CHARGE CHARACTERISTICS OF RED SOILS AS AFFECTED BY SURFACE PROPERTIES OF THE SOIL AND SPECIFIC ADSORPTION OF IONS
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    摘要:

    根据可变电荷和永久电荷共存的土壤体系的模式,研究了一个砖红壤和一个红壤胶体的表面电荷特性。由于两种土壤胶体的矿物成分和铁铝氧化物的含量不同,砖红壤胶体的pH。值、ZPNC和IEP都高于红壤胶体者。红壤胶体的永久负电荷量多,其pH0与ZPNC的差值也大。土壤加3%的有机质淹水培育4个月后,胶体的腐殖质含量增加不足0.5%,对胶体的pH0的影响不明显。砖红壤胶体用磷酸盐或硅酸盐处理后,表面正电荷减少,负电荷增多,pH0值和IEP都降低。磷酸盐的效应较硅酸盐为甚。不同浓度的KCl溶液中存在少量SO42-时,砖红壤胶体的正电荷减少,负电荷增加,ZPNC和pH0值降低;如存在少量Ca2+,则pH0值升高。以单一的K2SO4、为支持电解质时,pH0值较KCl者为高。

    Abstract:

    Surface charge characteristics of the clay fraction of a laterite derived from basalt and a red earth derived from Quaternary red clay in southern China were investigated based nn a model for describing charge characteristics of soil systems containing both permanent and variable charage minerals. pH0, ZPNC and IEP were used as indexes to characterize surface charge Properties. The pH0, denoting zero point of charge of variable charge system, was determined with potentiometric titration method. ZPNC, which means zero point of net charge of mixed systems with variable and permanent charge, was treasured with ion adsorption method. IEP was determined by electrophoresis method. The pH0 value, ZPNC,and lEP of the laterite were higher than that of the red earth due to differences in clay mineral composition and in content of oxides of iron and aluminum between these twa soils. Because the quantity of perrnarxent negative charge of the red earth was comparatively high, the difference between pHo and ZPNC for this soil was more remarkable. After the addition of 3% organic matter and incubation for four moxiths under submergic corAditxons, the humus content of the clay fraction of these soils increased by less than 0.5%, its effect on the pH0 value was indistinct.

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张效年,赵安珍.土壤电化学性质的研究——Ⅹ.红壤胶体的表面性状和离子专性吸附对表面电荷性质的影响[J].土壤学报,1988,25(2):164-174. Zhang Xiaonian, Zhao Anzhen. STUDIES ON ELECTROCHEMICAL PROPERTIES OF SOILS Ⅹ. CHARGE CHARACTERISTICS OF RED SOILS AS AFFECTED BY SURFACE PROPERTIES OF THE SOIL AND SPECIFIC ADSORPTION OF IONS[J]. Acta Pedologica Sinica,1988,25(2):164-174.

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  • 在线发布日期: 2013-02-25
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